BRAWLEY, Calif. (AP) — Ultimate Fighting Championship star Evan Tanner has died in the desert east of San Diego, possibly of heat exposure.

Sheriff's Lt. George Moreno says the 37-year-old Tanner was found Monday about two miles from his campsite in a remote area of the Palo Verdes Mountains, where temperatures had reached 110 degrees. Moreno says a preliminary coroner's report suggests Tanner died of heat exposure.

Tanner left for the desert last week to go camping and motorcycle riding.

His agent, John Hayner, says Tanner called a friend on Wednesday to say the dirt bike had run out of gas. He was about 100 miles from the nearest town.

Tanner is a former UFC champion middleweight. He lost his last bout in June.